Mill



i Oct. 28', 1930. R, H, BowMAN MILL Filed July l0. 1929 ,ze INVENTOR. l(2f af/fr //a MMM y By MM -p/P'Q,

' ATTORNEYJ.'

Patented. Oct. 28,`r 1930 UNITED STATEs PATENT oFFicE ROBERT H. KBOWMAN;OF AKRON, OHIO, .SSIGNOR TO llll? FIRESTONE TIRE & RUBBE COMPANY, OFAKRON, OHIO, CORPORATION OF OI-IIIIO` llllIILLy Application filed July10,

' 10 safety device in theform of a frangible disk or plate between themovable arbor of an adjustable roll and the adjusting means, said diskor plate being adapted to break under a heavy strain such as might becaused by some hard object finding its way into the mill so that saidobject cannot break or injure the expensive mill rolls, bearings or someother part of the mill. j

Heretofore in general, the use of such frangible disks or plates hasrendered adjustment of the mill rolls and replacement of broken diskssomewhat difficult. A screw has usually been provided for adjustment butit could only .be used to adjust the rolls in one way, that is towardeach other, and other means had to be employed to adjust the rolls theother way. Means have been more recently utilized which overcome these4difficulties tovsome extent but such means are not entirelysatisfactory. Thepresentinvention has for its object the provision of animprovedmillr roll adjusting devicefin which the safety'y plate isincorporated in such a way that rthe roll or 35,. rollsof a. mill maybeadjusted both-toward and from each other without aecting thefunctioning'v of the safety means if the mill should become overloadedfor any reason, and in which the safety plate is so mounted as to bequickly replaceable. j The foregoing yand otherobjects of the inventionare attained in the mill illustrated in the accompanying drawings anddescribed below. lt is to be understood that the inven- 4s .tion isnotlimited to vthe'speciiic form thereof shownand described. Y

Of the accompanying drawings, l Figurev 1 .isy a front elevation ofamill in which the invention may be embodied;

SQ Figure Qis an enlarged view partly in 1929. Serial No. 377,286.

section along line 2-2 of Figure 1 showing the invention embodied in themill;

Figure 3 is a section on line 3-3 of Figure 2; and

Figure 4 is `a detail elevation of the twopart frangible plate.

`Referring to the drawings, theusual mill includesk a bed plate 10provided with standards 11, 11 in which are journaled rolls 12 and 13,the formerin adjustable arbors 14; so as to be slidabletoward and fromthe latter on standards 11.

An adjusting screw 15 is threaded through a nut 16 in each of standards11, the outer end of each screw having a turning head 17 which may beapertured as at 18L to receive a bar (not shown) for turning the same.The

j inner end of each screw 15 is formed with a groove 19 and extends intoa cap 20 secured to each arbor 14. Cap 2O is formed with transverseslots 21, 21, whereby it is adapted to receive afrangible plate 22 madein two parts, (Figure 4) and adapted to be slid into the slots 21 fromopposite sides, the inner Yends ,of the plates being shaped to fit inthe groove 19,' whereby when the plates are inplace they embrace thescrew 15Lk in groove 19. To prevent displacement of the lplates 22suitable means such as hooks 23 pivoted'as at 241 on the caps 2O may behooked over studs 25, 25 on the outer ends of plates 22..

It will be seen that because of engagement of plates 22m groove 19adjusting the rolls 12 land 13 either together or apart is obtainedthrough the safety plates 22 in which the screws 15 rotate.- Should aplate 22-be broken toprevent injury to the millby rea.- son of anoverload, 'it may be quickly re-n placed by swinging back hooks 23,removing from slots 21and slidingkout of-the caps20v and new platesreplaced therefor.

It will be apparent from the foregoing that asimple, effective'safetydevice has been provided for kmills which permit ready ad`justment of the'mill rolls and the frangible plate which is easilyreplaced in case of breakage. j Y y j f Modifications of the inventionmay be resorted to without departing from the; spirit eay lee

thereof or the scope of the appended claims.

Vhat is claimed is: 1. In a mill, an adjustable mill roll and means foradjusting said roll including a screw, a safety cap connected to theroll, said screw extending into said cap and hav'- ing a peripheralgroove adjacent its end in the cap, said cap having slots therein, and atwo-part frangible plate slidable from opposite sides of the cap in theslots into embracing relation to the screw end and engagged in saidgroove, whereby said roll is adjustable in either direction by saidscrew through said frangible plate, and means for releasably retainingsaid plate in said cap, said means comprising pivotal hooks mounted onthe cap and engageable over studs on the outer edges ofthe 'rangibleplate.

2. In a mill, an adjustable mill roll and means for adjusting said rollincluding a screw, a safety cap connected to the roll, said screwextending into said cap and having a peripheral groove adjacent its endin the cap, said cap having slots therein, and ay two-part frangibleplate slidable from opposite sides of the cap in the slots intoembracing relation to the screw end and engaged in said groove, wherebysaid roll is adjustable in either direction by said screw through saidfrangible plate, and means for releasably retaining said plate in saidcap.

3. In a mill, an adjustable mill roll, means for adjusting said roll, asafety cap connected'to the roll, a two-part frangible plate slidablefrom opposite sides of the cap into inter-engaged relationship with saidadjusting means, whereby said roll is adjustable in either directionthrough said frangible plate, and means for releasably retaining saidplate in said cap, said means comprising pivotal hooks mounted on thecap and engageable over studs on the outer edges of the frangible plate.

4. In a mill, an adjustable mill roll and means for adjusting said rollincluding a screw, a safety cap connected to the roll, said screwextending into said cap andy having a peripheral groove adjacent its endin the cap, said cap having slots therein, and a two-part frangibleplate slidable from o pposite sides of the cap in the slots intointerengaged relationship with said adjusting means and engaged insaid'groove, whereby ysaid roll is adjustable in either direction bysaid screw through said frangible plate, and means for releasablyretaining4 said plate in said cap. Y

5. In a mill, an adjustable mill roll and means for' adjusting said rollincluding a screw, a 'safety cap connected to the roll,

Vsaid screw extending into said cap and having a peripheral grooveadjacent its end in the cap, said cap having slots therein, and atwo-part frangible plate slidable from opposite sides of the cap in theslots into inter# in inter-engaged relationship with said ad;-

justing means, wherebysaid roll is adjustable in either directionthrough said frangible plate.

In witnessv whereof I have hereunto affixed my signature this 5th day ofJuly, 1929.

ROBERT H. BOIVMAN.

